Manufacture of cement.



I VVI GOA TING R PLASTIC.

' g JACOB STEIGER, or

7 MANUFACTU RE O'FCEM .ENT. 9%

P TENT Ognicn.

- s1 Ec1r1oAr1o1r forming part of Letters men; No. 627,884, dated June 27, 1899.

LONDON, ENGLAND.

Appllcatio nfiled Ma'rchii, 1899. Serial No. 703,613. mospenm'enso v 1 i To all whom it may concervw- Be'it known that I, JACOB Srnrona, manufacturer, a citizen of the Republic of Switzerland, residing at 24 Finsbury Square, in the cityof London, England,'have inventedcerroof a cement in 1 5 herence to the materials.

tain new, anduseful Improvements. in the Manufacture of-Cemeutmf which the following is a specification.

This invention relates a dry pulverulent form which 1 can be used in admixture with water and any snitable'materials for the manufacture of artificial stone, artificial-fuel-blocks, and many other articles, the cement serving to give co- For this purpose I take a solution of chlorid of ma nesium and o silicateof' otas oro s1 lcateo soda mix same ihoroughT y, and after Hie clie'mical change has taken place I reduce the mass by s st n e.

I After coolalso prepare in ormo such as that obtained bycalcining magnesi e.

I thoroughly mix the powdered magnesia,

25 the, powdered combined chlorid of magnesium, and silicate of potash or of silicate of soda, prepared as above described, the mixture constituting a cement in form of a dry powder which can be used with water to 3o cement any suitable materials together.

I (dry-Qtwenty per cent. to twenty-Eve per b soda by means of evaporation of the two so- 5 part of the chlorid of magnesium remains byweight, of the ingre- The proportions,

: ch-lorid of ma nesium dients are as'follows sixty-five per cent. The main feature of the invention is the 3 production of adry mixture of chlorid of magnesium and silicate of potash or silicate of lotions, which. in being mixed andexposed i to heatingare subjected to chemical changes. The quantities of the two solutions must be determined in such a manner that a small unchanged as surplus quantity, while the other'part' (about a half to two-thirds). is

- transformed into hydrosilicate of magnesium and chlorid of alkali.

5o'of pure chlorid of magnesium canbe accomplished with great 'difliculties' While the reduction to a powder only, and hardly without chemical changes,

to the manufacture the calcined magnesia and act combinedupon hyd ratic qualities.

owing to their unchanged Experience has duced in the foregoing manner has been ex posed to the airwithout showing signs of deli quescenceand after mixture with water has shown remarkable strength and hardness. At the'sarnetime the tendency of chlorid of magnesium of attracting moisture in the air is eliminated, so that there can be no later cement. This is due partly to a reduced amount of free chlorid of magnesium, owing to the combination of the latter with the silicate, but especially to the formation of a double saltby the surplus'chlorid of magnethe chemical actionof the chlorid of magnesium on the silicate, which chlorid of alkali even exceeds the chlorid of magnesium in its cementing property. Of further favorable efiect is the magnesium silicate produced in the same manner and reduced to a powder, because the silica contained therein is' in fluence (which is simultaneous with the acture.

Tests have shown that only such mixtures have been produced in the above-described manner have had a beneficial effect uponthehardness of the objects produced therewith, while the application of the two substances in liquid form-Orin powdered form, but dried separately and subsequently mixed, did not exercise the same favorable influence. This invention distinguishes itself therefore from been used by a mixture of chlorid ofmagnesium and of silicate of potash or soda, subse shown that cement pro-J This sweating of the manufactured and hardened I sium with the chlorid of alkali, produced by such favorable easily-soluble hydrated condition that its hardening and cementing intion ofthe chlorid-of magnesium) upon the calcined-magnesia becomes a prominent feaof chlorid of magnesium and silicate which processes hitherto known where silicates have 6o magnesium retain their cementing qualities quent reduction to po 1 0 means of evaporation, and the production of a dry mixture of chlorid of magnesium, chlorid of alkali, and silicate of magnesium, which can be transformed into a durable, dry, and highly-eflicient cement by the addition of calcined magnesium.

I claim 1. Process for the manufacture of a silicated magnesia cement in dry form, by mixing solutions of chlorid of magnesium and silicate of potash, or soda, reducing the mass, thus 4 mixed, to a dry powder by heating and adding calcined magnesia, substantially as set forth.

- 2. Process for the manufacture of a silicated magnesia cement in dry form, consisting of No references mass by anm A -,5 mixing a solution of chlorid of magnesium with a solution -of silicate of soda or potash in suitable proportions to form hydrosilicate of magnesium and chlorid of alkali and to leave a small part of unchanged chlorid of magnesium; evaporating; drying and powdering'the mixture; and adding thereto a suitable proportion of powdered calcined magnesium, substantially as set forth.

Intestimony whereof I have hereunto set my hand in presence of two subscribing witnesses;

JACOB S'IIEIGER.

Witnesses:

RUDOLF DIETZ, GUSTAVE HARR. 

